Have a look at the following rules-
Two or more certificates, diplomas, or degrees.
Important notice: One must be for a program of three or more years.
ECA assessment results:
A three-year or more certificate, diploma, or degree
PLUS any of the results in the sections below (
not including secondary/high school), or:
- Post-Bachelor's Certificate
- Post-undergraduate certificate
- Post-Bachelor's Diploma
- Post-undergraduate diploma
- Graduate Certificate
- Graduate Certificate with a focus in [area of concentration]
- Postgraduate certificate
- Postgraduate Diploma
- Graduate Diploma with a focus in [area of concentration]
- Graduate diploma
- two-year Postgraduate Diploma, specializing in [name of discipline]
- two-year Bachelor’s after degree with a focus in [area of concentration]
- one-year Postgraduate Certificate in [name of discipline]
- Dual Bachelor’s degree (four years)
source:
https://www.canada.ca/en/immigration-refugees-citizenship/services/immigrate-canada/express-entry/become-candidate/eligibility/education-assessed/read-report.html
As you can see, your post secondary school diploma
does not fit to the above criteria, You cannot claim "Two or more certificates, diplomas, or degrees" points. You only can claim 3 years bachelor's degree points.
Hope it helps, Good Luck!